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According to the principle of heat exchange, in an isolated system the heat lost by the hot object is equal to:
Atwice the heat gained by the cold object
Bhalf the heat gained by the cold object
Cthe heat gained by the cold object
Dthe heat lost to the surroundings
Answer & Solution
Correct answer: C. the heat gained by the cold object
1. In an isolated (heat-resistant) box, no energy enters or leaves.
2. The hot object loses heat and the cold object gains heat until temperatures equalise.
3. By conservation of energy: heat lost by hot object = heat gained by cold object.
4. There is no exchange with the surroundings, so option D is ruled out.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 5 "Heat", p.78_
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